From: Mark Lord <liml@rtr.ca>
Date: Mon, 19 Jan 2009 23:05:42 +0000 (-0500)
Subject: sata_mv: don't read hc_irq_cause
X-Git-Tag: v2.6.29-rc3~13^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cae6edc3b5a536119374a5439d9b253cb26f05e1;p=pandora-kernel.git

sata_mv: don't read hc_irq_cause

Remove silly read-modify-write sequences when clearing interrupts
in hc_irq_cause.  This gets rid of unneeded MMIO reads, resulting in
a slight performance boost when switching between EDMA and non-EDMA
modes (eg. for cache flushes).

Signed-off-by: Mark Lord <mlord@pobox.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
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